On Mon, Oct 29, 2012 at 06:34:37PM +0200, Avi Kivity wrote:
> On 10/29/2012 01:37 AM, John Williams wrote:
>
> >> IMO, an mr per reg would just add a massive overhead for no win.
> >
> > I tend to agree with Edgar here - QEMU has a careful line to walk between
> > being an emulator and an RTL si
On 10/29/2012 01:37 AM, John Williams wrote:
>> IMO, an mr per reg would just add a massive overhead for no win.
>
> I tend to agree with Edgar here - QEMU has a careful line to walk between
> being an emulator and an RTL simulator.
>
> Any WAG on the runtime overhead of a mem region per regist
On 10/27/2012 06:12 AM, Edgar E. Iglesias wrote:
>
> Hi,
>
> If well designed, most hw has a well designed symtery between regs
> that makes things simpler if you can just opencode the decding.
> IMO, an mr per reg would just add a massive overhead for no win.
> And also, hw implemented decoders
> -Original Message-
> From: Edgar E. Iglesias [mailto:edgar.igles...@gmail.com]
> Sent: Saturday, 27 October 2012 2:12 PM
> To: Peter Crosthwaite
> Cc: qemu-devel@nongnu.org Developers; Avi Kivity; Peter Maydell; John
> Williams
> Subject: Re: [Qemu-devel] [RFC
On Fri, Oct 26, 2012 at 05:03:04PM +1000, Peter Crosthwaite wrote:
> In my recent USB series Avi mentioned he wanted to do some work with
> the memory API and encourage devices to use the memory API to do
> fine-grained register decoding, i.e. each register is its own
> MemoryRegion. This has the a
Hi,
> For actually writing into the device registers, its just uses an array
> index, no need to switch (ret = s->regs[addr]). However for my side
> effects I will need to populate that switch. If we convert to fine
> grained memory regions then the switch goes away and my side effect
> become p
In my recent USB series Avi mentioned he wanted to do some work with
the memory API and encourage devices to use the memory API to do
fine-grained register decoding, i.e. each register is its own
MemoryRegion. This has the advantage of getting rid of the symmetric
switch statements in the read and
